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How to perform an operation on the server side through the Event Handler?


Greyscail
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I have this for my Event Handler class:

 

public class ModEventHandler
{
	@SubscribeEvent
	public static void dualWield(MouseEvent event)
	{
      	// bunch of code
      
      	boolean isSuccessfulAttack = target.attackEntityFrom(DamageSource.causePlayerDamage(player), damage);
      
      	// bunch of code
	}
}

 

Registered as follows:

 

@EventHandler
	public void preInit(FMLInitializationEvent event)
	{
		MinecraftForge.EVENT_BUS.register(ModEventHandler.class);
	}

 

Where I've basically copied the code minecraft uses when you left click except I've altered it to allow attacking with the offhand weapon. My issue is that the line of code responsible for actually doing the damage seemingly only works when called from the server side. I have no clue how to remedy this, I've tried putting:

 

public class ModEventHandler
{
	@SideOnly(Side.SERVER)
	@SubscribeEvent
	public static void dualWield(MouseEvent event)
	{
      	// bunch of code
      
      	boolean isSuccessfulAttack = target.attackEntityFrom(DamageSource.causePlayerDamage(player), damage);
      
      	// bunch of code
	}
}

 

But that just crashes. The issue I'm having is how should I call something from the server if it is running in my Event Handler?

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Just now, diesieben07 said:

You don't understand the difference between logical and physical side. Once again: read and understand the documentation. If you have questions, ask.

 

You need packets.

hehe, I'm just more of a learn by example type of person rather than the type to dig through an instruction manual, had I ever seen packets being used then I'd have probably figured that out sooner

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22 minutes ago, Greyscail said:

I have this for my Event Handler class:

 


public class ModEventHandler
{
	@SubscribeEvent
	public static void dualWield(MouseEvent event)
	{
      	// bunch of code
      
      	boolean isSuccessfulAttack = target.attackEntityFrom(DamageSource.causePlayerDamage(player), damage);
      
      	// bunch of code
	}
}

 

Registered as follows:

 


@EventHandler
	public void preInit(FMLInitializationEvent event)
	{
		MinecraftForge.EVENT_BUS.register(ModEventHandler.class);
	}

 

Where I've basically copied the code minecraft uses when you left click except I've altered it to allow attacking with the offhand weapon. My issue is that the line of code responsible for actually doing the damage seemingly only works when called from the server side. I have no clue how to remedy this, I've tried putting:

 


public class ModEventHandler
{
	@SideOnly(Side.SERVER)
	@SubscribeEvent
	public static void dualWield(MouseEvent event)
	{
      	// bunch of code
      
      	boolean isSuccessfulAttack = target.attackEntityFrom(DamageSource.causePlayerDamage(player), damage);
      
      	// bunch of code
	}
}

 

But that just crashes. The issue I'm having is how should I call something from the server if it is running in my Event Handler?

Some events are only read by the logical client, or logical server, or both, depending on the result of the event. Therefore, if only a client responds, you need to send packets to the logical server telling it to perform certain code that the client is not responsible for performing, like @diesieben07 mentioned.

NOTE: if you perform server-side code on client-side, it may not work... packets...

Edited by Differentiation
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3 hours ago, Differentiation said:

Some events are only read by the logical client, or logical server, or both, depending on the result of the event. Therefore, if only a client responds, you need to send packets to the logical server telling it to perform certain code that the client is not responsible for performing, like @diesieben07 mentioned.

NOTE: if you perform server-side code on client-side, it may not work... packets...

 

Ok I've set all that up and works to an extent except the problem hasn't been solved, I have:

 

boolean isSuccessfulAttack = target.attackEntityFrom(DamageSource.causePlayerDamage(player), damage);

System.out.println(Thread.currentThread().getName());

 

And the console says Server Thread but target.attackEntiityFrom() still returns false

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30 minutes ago, Greyscail said:

target.attackEntityFrom(DamageSource.causePlayerDamage(player), damage)

Is this a boolean statement?

 

Can you please show us ALL the code you have so that we can help?

 

You might also want to incorporate this code to check for the running side:

public class SideTest //Not the name I recommend, nor do I have this name, but incorporate the below method in some class...
{
	public static void getSide(World worldIn)
	{
		if (worldIn.isRemote)
		{
    			System.out.println("CLIENT");
		}

		if (!worldIn.isRemote)
		{
          		System.out.println("SERVER"); //These show as the color RED in the client as info, so it's easy to see!
		}
    	}
}

 

And then where ever you want to test for the side, you call this static method.

 

This is how I test the running thread on my mod.

 

 

If the server is NOT running, then the boolean statement will not run and will automatically return false since the server did not read it, of course. Then this means that you need to send a packet to the server.

 

I hope I made things a bit more clear!

Try what I told you, then respond with the results :)

 

If you're still having trouble

 

Oh, and lastly, please don't use @SideOnly(Side.SERVER) or @SideOnly(Side.CLIENT), they don't help in this context.

Edited by Differentiation
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1 minute ago, Differentiation said:

Is this a boolean statement?

 

Can you please show us ALL the code you have so that we can help?

 

You might also want to incorporate this code to check for the running side:


if (worldIn.isRemote)
{
    System.out.println("CLIENT");
}

if (!worldIn.isRemote)
{
    System.out.println("SERVER");
}

 

If the server is NOT running, then the boolean statement will not run and will automatically return false since the server did not read it, of course. Then this means that you need to send a packet to the server.

 

I hope I made things a bit more clear!

Try what I told you, then respond with the results :)

 

And lastly, please don't use @SideOnly(Side.SERVER) or @SideOnly(Side.CLIENT), they don't help in this context.

 

Yea it's a boolean, and I'm hesitant to show all of my code because it'd be a huge mess with how spread out it is. And yea, it definitely says client side using the method showed me which is annoying because I'm certain I set the message system up properly and it definitely says Server Thread when I ran:

 

System.out.println(Thread.currentThread().getName());
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1 minute ago, Greyscail said:

 

Yea it's a boolean, and I'm hesitant to show all of my code because it'd be a huge mess with how spread out it is. And yea, it definitely says client side using the method showed me which is annoying because I'm certain I set the message system up properly and it definitely says Server Thread when I ran:

 


System.out.println(Thread.currentThread().getName());

I mean, my method would, in this case, be more accurate... and, since you're getting false for the boolean, and the fact that my method says CLIENT, then only the client runs, which means you need to start sending packets!

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public class ModEventHandler
{
	private static final int LMB = 0, RMB = 1;

	private static enum WEAPON
	{
		ItemSword, ItemAxe
	}

	@SubscribeEvent
	public void dualWield(MouseEvent event)
	{
		if (event.isButtonstate())
		{
			Minecraft minecraft = Minecraft.getMinecraft();

			EntityPlayerSP player = minecraft.player;

			ItemStack mainhand = player.getHeldItem(EnumHand.MAIN_HAND);
			ItemStack offhand = player.getHeldItem(EnumHand.OFF_HAND);

			String primaryType = mainhand.getItem().getClass().getSimpleName();
			String secondaryType = offhand.getItem().getClass().getSimpleName();

			try
			{
				WEAPON.valueOf(primaryType);
				WEAPON.valueOf(secondaryType);
			}
			catch (IllegalArgumentException e)
			{
				return;
			}

			if (event.getButton() == RMB)
			{
				if (!minecraft.player.isRowingBoat())
				{
					switch (minecraft.objectMouseOver.typeOfHit)
					{
					case ENTITY:

						// minecraft.playerController.attackEntity(player,
						// minecraft.objectMouseOver.entityHit);

						// minecraft.playerController.syncCurrentPlayItem();

						if (minecraft.playerController.getCurrentGameType() != GameType.SPECTATOR)
						{
							AttackHandler.attackQueue.add(new Attack(player, minecraft.objectMouseOver.entityHit));

							ExampleMod.INSTANCE.registerMessage(ModMessageHandler.class, ModMessage.class, ExampleMod.id++, Side.SERVER);
							ExampleMod.INSTANCE.sendToServer(new ModMessage(ModMessageHandler.DO_ATTACK));
						}

						break;

					case BLOCK:

						BlockPos blockpos = minecraft.objectMouseOver.getBlockPos();

						if (!minecraft.world.isAirBlock(blockpos))
						{
							minecraft.playerController.clickBlock(blockpos, minecraft.objectMouseOver.sideHit);

							break;
						}

					case MISS:

						minecraft.player.resetCooldown();

						net.minecraftforge.common.ForgeHooks.onEmptyLeftClick(player);
					}
				}

				player.setActiveHand(EnumHand.OFF_HAND);
				player.swingArm(EnumHand.OFF_HAND);
			}
		}
	}
}
public class ModMessageHandler implements IMessageHandler<ModMessage, IMessage>
{
	public static final int DO_ATTACK = 0;
	
	@Override
	public IMessage onMessage(ModMessage message, MessageContext ctx)
	{
		EntityPlayerMP serverPlayer = ctx.getServerHandler().player;

		int code = message.code;

		serverPlayer.getServerWorld().addScheduledTask(() ->
		{
			switch (code)
			{
			case DO_ATTACK:

				AttackHandler.attack();
				
				break;

			default:

				break;
			}
		});

		return null;
	}
}
public class AttackHandler
{
	public static final ArrayList<Attack> attackQueue = new ArrayList<Attack>();

	public static void attack()
	{
		Attack attack = attackQueue.get(0);

		attack(attack.getAttacker(), attack.getAttacked());

		attackQueue.remove(0);
	}

	public static void attack(EntityPlayer player, Entity target)
	{
		if (!net.minecraftforge.common.ForgeHooks.onPlayerAttackTarget(player, target)) return;
		if (target.canBeAttackedWithItem())
		{
			if (!target.hitByEntity(player))
			{
				float damage = (float) player.getEntityAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).getAttributeValue();
				float enchantmentModifier;

				if (target instanceof EntityLivingBase)
				{
					enchantmentModifier = EnchantmentHelper.getModifierForCreature(player.getHeldItem(EnumHand.OFF_HAND), ((EntityLivingBase) target).getCreatureAttribute());
				}
				else
				{
					enchantmentModifier = EnchantmentHelper.getModifierForCreature(player.getHeldItem(EnumHand.OFF_HAND), EnumCreatureAttribute.UNDEFINED);
				}

				float swingModifier = player.getCooledAttackStrength(0.5F);

				damage *= (0.2F + swingModifier * swingModifier * 0.8F);
				enchantmentModifier *= swingModifier;

				player.resetCooldown();

				if (damage > 0.0F || enchantmentModifier > 0.0F)
				{
					boolean isFullSwing = swingModifier > 0.9F;
					boolean isKnockbackStrike = false;

					int knockbackLevel = EnchantmentHelper.getKnockbackModifier(player);

					if (player.isSprinting() && isFullSwing)
					{
						player.world.playSound((EntityPlayer) null, player.posX, player.posY, player.posZ, SoundEvents.ENTITY_PLAYER_ATTACK_KNOCKBACK, player.getSoundCategory(), 1.0F, 1.0F);

						++knockbackLevel;

						isKnockbackStrike = true;
					}

					boolean isCriticalStrike = isFullSwing && player.fallDistance > 0.0F && !player.onGround && !player.isOnLadder() && !player.isInWater() && !player.isPotionActive(MobEffects.BLINDNESS) && !player.isRiding() && target instanceof EntityLivingBase;

					// isCriticalStrike = isCriticalStrike && !player.isSprinting();
					isCriticalStrike &= !player.isSprinting();

					net.minecraftforge.event.entity.player.CriticalHitEvent hitResult = net.minecraftforge.common.ForgeHooks.getCriticalHit(player, target, isCriticalStrike, isCriticalStrike ? 1.5F : 1.0F);

					isCriticalStrike = hitResult != null;

					if (isCriticalStrike)
					{
						damage *= hitResult.getDamageModifier();
					}

					damage = damage + enchantmentModifier;

					boolean isSweepingStrike = false;

					double d0 = (double) (player.distanceWalkedModified - player.prevDistanceWalkedModified);

					if (isFullSwing && !isCriticalStrike && !isKnockbackStrike && player.onGround && d0 < (double) player.getAIMoveSpeed())
					{
						ItemStack itemstack = player.getHeldItem(EnumHand.OFF_HAND);

						if (itemstack.getItem() instanceof ItemSword)
						{
							isSweepingStrike = true;
						}
					}

					float targetHealth = 0.0F;

					boolean hasSetFire = false;

					int fireaspectModifier = EnchantmentHelper.getFireAspectModifier(player);

					if (target instanceof EntityLivingBase)
					{
						targetHealth = ((EntityLivingBase) target).getHealth();

						if (fireaspectModifier > 0 && !target.isBurning())
						{
							hasSetFire = true;

							target.setFire(1);
						}
					}

					double d1 = target.motionX;
					double d2 = target.motionY;
					double d3 = target.motionZ;

					if (target.getEntityWorld().isRemote)
					{
					    System.out.println("CLIENT");
					}

					if (!target.getEntityWorld().isRemote)
					{
					    System.out.println("SERVER");
					}
					
					boolean isSuccessfulAttack = ((EntityLivingBase) target).attackEntityFrom(DamageSource.causePlayerDamage(player), damage);

					target.performHurtAnimation();

					if (isSuccessfulAttack)
					{
						if (knockbackLevel > 0)
						{
							if (target instanceof EntityLivingBase)
							{
								((EntityLivingBase) target).knockBack(player, (float) knockbackLevel * 0.5F, (double) MathHelper.sin(player.rotationYaw * 0.017453292F), (double) (-MathHelper.cos(player.rotationYaw * 0.017453292F)));
							}
							else
							{
								target.addVelocity((double) (-MathHelper.sin(player.rotationYaw * 0.017453292F) * (float) knockbackLevel * 0.5F), 0.1D, (double) (MathHelper.cos(player.rotationYaw * 0.017453292F) * (float) knockbackLevel * 0.5F));
							}

							player.motionX *= 0.6D;
							player.motionZ *= 0.6D;
							player.setSprinting(false);
						}

						if (isSweepingStrike)
						{
							float areaDamage = 1.0F + EnchantmentHelper.getSweepingDamageRatio(player) * damage;

							for (EntityLivingBase entitylivingbase : player.world.getEntitiesWithinAABB(EntityLivingBase.class, target.getEntityBoundingBox().grow(1.0D, 0.25D, 1.0D)))
							{
								if (entitylivingbase != player && entitylivingbase != target && !player.isOnSameTeam(entitylivingbase) && player.getDistanceSqToEntity(entitylivingbase) < 9.0D)
								{
									entitylivingbase.knockBack(player, 0.4F, (double) MathHelper.sin(player.rotationYaw * 0.017453292F), (double) (-MathHelper.cos(player.rotationYaw * 0.017453292F)));
									entitylivingbase.attackEntityFrom(DamageSource.causePlayerDamage(player), areaDamage);
								}
							}

							player.world.playSound((EntityPlayer) null, player.posX, player.posY, player.posZ, SoundEvents.ENTITY_PLAYER_ATTACK_SWEEP, player.getSoundCategory(), 1.0F, 1.0F);
							player.spawnSweepParticles();
						}

						if (target instanceof EntityPlayerMP && target.velocityChanged)
						{
							((EntityPlayerMP) target).connection.sendPacket(new SPacketEntityVelocity(target));
							target.velocityChanged = false;
							target.motionX = d1;
							target.motionY = d2;
							target.motionZ = d3;
						}

						if (isCriticalStrike)
						{
							player.world.playSound((EntityPlayer) null, player.posX, player.posY, player.posZ, SoundEvents.ENTITY_PLAYER_ATTACK_CRIT, player.getSoundCategory(), 1.0F, 1.0F);
							player.onCriticalHit(target);
						}

						if (!isCriticalStrike && !isSweepingStrike)
						{
							if (isFullSwing)
							{
								player.world.playSound((EntityPlayer) null, player.posX, player.posY, player.posZ, SoundEvents.ENTITY_PLAYER_ATTACK_STRONG, player.getSoundCategory(), 1.0F, 1.0F);
							}
							else
							{
								player.world.playSound((EntityPlayer) null, player.posX, player.posY, player.posZ, SoundEvents.ENTITY_PLAYER_ATTACK_WEAK, player.getSoundCategory(), 1.0F, 1.0F);
							}
						}

						if (enchantmentModifier > 0.0F)
						{
							player.onEnchantmentCritical(target);
						}

						player.setLastAttackedEntity(target);

						if (target instanceof EntityLivingBase)
						{
							EnchantmentHelper.applyThornEnchantments((EntityLivingBase) target, player);
						}

						EnchantmentHelper.applyArthropodEnchantments(player, target);

						ItemStack weapon = player.getHeldItem(EnumHand.OFF_HAND);

						Entity entity = target;

						if (target instanceof MultiPartEntityPart)
						{
							IEntityMultiPart ientitymultipart = ((MultiPartEntityPart) target).parent;

							if (ientitymultipart instanceof EntityLivingBase)
							{
								entity = (EntityLivingBase) ientitymultipart;
							}
						}

						if (!weapon.isEmpty() && entity instanceof EntityLivingBase)
						{
							ItemStack beforeHitCopy = weapon.copy();
							weapon.hitEntity((EntityLivingBase) entity, player);

							if (weapon.isEmpty())
							{
								net.minecraftforge.event.ForgeEventFactory.onPlayerDestroyItem(player, beforeHitCopy, EnumHand.OFF_HAND);
								player.setHeldItem(EnumHand.OFF_HAND, ItemStack.EMPTY);
							}
						}

						if (target instanceof EntityLivingBase)
						{
							float f5 = targetHealth - ((EntityLivingBase) target).getHealth();
							player.addStat(StatList.DAMAGE_DEALT, Math.round(f5 * 10.0F));

							if (fireaspectModifier > 0)
							{
								target.setFire(fireaspectModifier * 4);
							}

							if (player.world instanceof WorldServer && f5 > 2.0F)
							{
								int k = (int) ((double) f5 * 0.5D);
								((WorldServer) player.world).spawnParticle(EnumParticleTypes.DAMAGE_INDICATOR, target.posX, target.posY + (double) (target.height * 0.5F), target.posZ, k, 0.1D, 0.0D, 0.1D, 0.2D);
							}
						}

						player.addExhaustion(0.1F);
					}
					else
					{
						player.world.playSound((EntityPlayer) null, player.posX, player.posY, player.posZ, SoundEvents.ENTITY_PLAYER_ATTACK_NODAMAGE, player.getSoundCategory(), 1.0F, 1.0F);

						if (hasSetFire)
						{
							target.extinguish();
						}
					}
				}
			}
		}
	}

	public static class Attack
	{
		EntityPlayer attacker;
		Entity attacked;

		public Attack(EntityPlayer attacker, Entity attacked)
		{
			this.attacker = attacker;
			this.attacked = attacked;
		}

		public EntityPlayer getAttacker()
		{
			return attacker;
		}

		public Entity getAttacked()
		{
			return attacked;
		}
	}
}

 

@Differentiation Erm that's my code I really don't know what's wrong... :(

 

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1 minute ago, Differentiation said:

This is client-side. Server code does not read from here on.

But I thought it wouldn't matter since that was all from before:

 

AttackHandler.attackQueue.add(new Attack(player, minecraft.objectMouseOver.entityHit));

ExampleMod.INSTANCE.registerMessage(ModMessageHandler.class, ModMessage.class, ExampleMod.id++, Side.SERVER);
ExampleMod.INSTANCE.sendToServer(new ModMessage(ModMessageHandler.DO_ATTACK));

 

I thought everything before that wouldn't matter

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Just now, Differentiation said:

What do you mean "before that"? Your code is clearly mixed there!

I still don't get it, how is it mixed? The only line of code that I'm having issues with is:

 

boolean isSuccessfulAttack = ((EntityLivingBase) target).attackEntityFrom(DamageSource.causePlayerDamage(player), damage);

 

And I was told that it needed to be called from the server side. The way you're making it sound is like everything I wrote needs to be called from the server side. For one, the first class where the bulk of the code is, is my Event Handler so I couldn't make that server side even if I wanted to

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